[duo_web_sdk] Add new typing for duo_web_sdk (#41887)

* Add new typing for duo_web_sdk

* Fix functions

types/duo_web_sdk/duo_web_sdk-tests.ts

@@ -0,0 +1,21 @@
+import * as Duo from "duo_web_sdk";
+
+Duo.init({
+    host: "http://example.com",
+    sig_request: "sig_request",
+    iframe: "iframe_id",
+    iframeContainer: "container_id",
+    iframeAttributes: {
+      title: "title",
+      height: "200px",
+      width: "200px",
+    },
+    post_action: "/post_destination",
+    post_argument: "post_argument",
+    submit_callback: (duo_form: HTMLFormElement) => duo_form,
+});
+
+Duo._onReady(() => {});
+Duo._parseSigRequest("sig");
+Duo._isDuoMessage(new MessageEvent("event"));
+Duo._doPostBack("response");

types/duo_web_sdk/index.d.ts

@@ -0,0 +1,30 @@
+// Type definitions for non-npm package duo_web_sdk-browser 2.7
+// Project: https://github.com/duosecurity/duo_web_sdk
+// Definitions by: Low Heok Hong <https://github.com/lhhong>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export as namespace Duo;
+
+export interface InitOptions {
+    host: string;
+    sig_request: string;
+    iframe?: string | HTMLIFrameElement;
+    iframeContainer?: string | HTMLElement;
+    iframeAttributes?: object;
+    post_action?: string;
+    post_argument?: string;
+    submit_callback?: (duo_form: HTMLFormElement) => void;
+}
+
+export interface ParsedSig {
+    sigRequest: string;
+    duoSig: string;
+    appSig: string;
+}
+
+export function init(options: InitOptions): void;
+
+export function _onReady(callback: () => void): void;
+export function _parseSigRequest(sig: string): ParsedSig;
+export function _isDuoMessage(event: MessageEvent): boolean;
+export function _doPostBack(response: string): void;

types/duo_web_sdk/tsconfig.json

@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "duo_web_sdk-tests.ts"
+    ]
+}

types/duo_web_sdk/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }